<template>
  <el-container class="home-container">
    <!--头部区域-->
    <el-header>
      <div>
        <img src="../assets/youzhiqiangshou.png" alt="" class="header-img">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!--页面主体区域-->
    <el-container>
      <!--左侧边栏-->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!--左侧菜单区域-->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409EFF"
          unique-opened :collapse="isCollapse" :collapse-transition="false" router :default-active="activePath">
          <!--一级菜单-->
          <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
            <!--一级菜单的模板区域-->
            <template slot="title">
              <!--图标-->
              <i :class="iconsObj[item.id]"></i>
              <!--文字-->
              <span>{{ item.authName }}</span>
            </template>
            <!--二级菜单-->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children"
                          :key="subItem.id" @click="saveNavState('/' + subItem.path)">
              <!--二级菜单的模板区域-->
              <template slot="title">
                <!--图标-->
                <i class="el-icon-menu"></i>
                <!--文字-->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>

        </el-menu>
      </el-aside>
      <!--右侧主体内容区域-->
      <el-main>
        <!--路由占位符-->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  name: "Home",
  created () {
    this.getMenuList();
    this.activePath = window.sessionStorage.getItem('activePath');
    this.activePath = activePath;
  },
  data() {
    return{
      //左侧菜单数据
      menuList: [],
      /* 一级菜单不同图标的设置 */
      iconsObj: {
        '125': 'el-icon-user-solid',
        '103': 'el-icon-s-management',
        '101': 'el-icon-s-goods',
        '102': 'el-icon-s-order',
        '145': 'el-icon-s-data'
      },
      //是否折叠
      isCollapse: false,
     //被激活的链接地址
      activePath: ''
    }
  },
  methods: {
    /* 实现退出功能：清空token，同时跳转到登录页面 */
    logout() {
      window.sessionStorage.clear();
      this.$router.push("/login");
    },
    /* 获取所有菜单 */
    async getMenuList() {
      const {data: res} = await this.$http.get('menus');
      if (res.meta.status !==200) {
        return this.$message.error(res.meta.msg);
      }
      this.menuList=res.data
    },
    /* 实现菜单的折叠与展开 */
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    /* 保存链接的激活状态 */
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath)
    }

  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}

.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between; /* 左右贴边对齐 */
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;

  > div {
    display: flex;
    align-items: center;
  }

  span {
    margin-left: 15px;
  }
}

.header-img {
  height: 90px;
  width: 70px;
}

.el-aside {
  background-color: #333744;
  .el-menu {
    border-rigth: none;

  }
}

.iconfont{
  margin-right: 10px;  /* 图标和文字的距离（？） */
}

.toggle-button{
  background-color: #4A5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}

</style>
